Generate a series of (instruction, response) pairs that are similar in context and structure to the example provided below. Each pair should consist of a concise instruction followed by an appropriate, detailed response. The instruction should pose a clear task or question, while the response should provide a comprehensive answer or solution that could be understood by someone with a basic understanding of the subject.

Example pair: 
Instruction: Summarize the following excerpt and explain what it has to say about the history of pop music:

The first time the term “pop” was used to describe a piece of music that had a popular appeal was in 1926, recorded in the form of “pop song”. In fact, the 1920s is widely regarded as the time of birth of the modern music era because that’s when the recorded industry started to bloom.

During that decade, electronic recordings were first introduced, which was a huge deal for the music industry. As such, most experts agree that the 1920s was when we came to recognize pop music as we know it today, sparked by blues, hillbilly, and country music.

As I mentioned early on, pop in “pop music” stands for popular. Ever since it was first used, this term has continued to be the go-to term when describing the ever-changing music preferred by the general taste. While it’s true that the term hadn’t been officially applied until the 1950s, we can trace pop music by a few decades prior to that.
Response: Pop music first originated in the 1920s, the era of modern music where the word 'pop' was associated with particular types of music with a distinct appeal. At the same time, we saw the rise of electronic recordings, which marked this decade as the definitive year for the discovery of pop music. The word 'pop' was coined from 'popular' and it was used to describe the varying trends and tastes held by different generations and audiences. It wasn't applied till the 1950s.

Your task is to generate more pairs that maintain this level of clarity and detail. The topic is Summarization. Write a long text of instruction by yourself, then summarize the given instruction in a response. Ensure that the responses are informative and accurate, suitable for an educational context. 

Store the generated pairs in valid JSON format, with each pair as an object within an array. Each object should have two key-value pairs: "instruction" and "response". For instance: 

{"contents": [{"instruction": "text", "response": "text"}, {"instruction": "text", "response": "text"}, ...]} 

Remember to maintain consistency in the format and ensure the generated pairs are diverse and cover a broad range of subjects. You must return the response in the asked format and you must not add any additional text in your response.

Explain the concept of natural selection as proposed by Charles Darwin and its significance in the theory of evolution.
user
Natural selection, a concept introduced by Charles Darwin, is the process through which species adapt to their environment. It posits that individuals with traits better suited to their environment are more likely to survive and reproduce. Over time, these advantageous traits become more common within the population. This mechanism is fundamental to the theory of evolution, as it explains how species evolve over generations through gradual changes in their genetic makeup.
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